Process of producing molybdates



Patented Na. 11,1924,

UNITED STATES PATENT" OFFICE.

ALAN Krssocx, or LOS ANGELES, CALIFORNIA, ASSIGNOR T0 CARL M. LOEB, or'nnw YORK, N. Y.

TROCESS OF PRODUCTNG IVTOLYBDATES.

No Drawing.

7 '0 all whom it may concern Be 1t known that I, ALAN lx-issooli, a cit1zen'ofthe United States, residing at Los Angeles, in the county'of Los Angeles and State of California, have invented a new and useful Process of Producing Mo-lybtion is to provide a process whereby there is produced direct from theore or ore concentrate a finished product suitable for use directly in the steel furnace in the manufac.- ture of alloy steel, and at a great reduction of cost and increase of efiiciency over processes heretofore known. r

The invention consists essentially in subjecting molybdenum and iron containing materials to an oxidizing roast, and at a temperature sufficient tocause them to split up and combine to form iron molybdate.

Using molybdenite, a commonly occura ring sulfide ore of molybdenum, andiron oxide, the probable reaction is 3MoS +2FeO+22O':Fe (),.3MoO +680 In this reaction, the ferrous oxide is oxidized to the ferric state, and the molybde- 'num is probably oxidized to the 'trioxide; although under some conditions molybdenum trioxide is volatile, there isano escape of molybdenum trioxide in this reaction; evi dently it exists only for an instant, and immediately combines with the ferric oxide before it has time to escape as the trioxide. All the molybdenum appears as ferric molybdate.

Application .filed April 1,

'iron, usually as the sulfide or oxide.

1924. Serial No. 703,533.

Using molybdenitc and iron pyrites, the probable reaction is z iuos +eres,+a2o:ie,o,.:n10(),+icso or expressed in two stages In these reactions also, the molybdenum apparently exists as the trioxide only for an instant, because no trioxide escapes during the process. As in the first case, all the molybdenum appears as ferric molybdate.

The reacting materials are first roasted 'ata temperature of about 5-600 Centigrade,

which is gradually increaseduntil the reaction is complete at about 1000 centigrade/ Certain naturally occurring ores of molybdenum, such as 'molybdenite, already contain If there is sufiicient iron already present in the ore, it may be subjected to the oxidizing roast without the addition of any iron, or with the addition of only a suflicient amount of iron to bring the iron content to the proper point. This utilization of a naturally occurring ore containing both iron and molybdenum to produce iron'molybdate without adding any more iron, or adding only sufiicient iron for the purposes of the reaction, is a very important feature of this invention, because of the evident economy.

The theoretical proportions of ironand molybdenum are one part by weight of molybdenum to 0.4 part by weight of iron. 'If

sufiicie-nt'iron,more may be added,as the oxide or sulfide, tobring up the iron content to'the'pro e'rfpointa The mo ybdenite ore which sometimes contains only 1% molybdenite, or the mixture of molybdenum and iron ore, is first concentrated so as to contain about of molybdenite. Flotation or other known processes may be used to effect this concentration.

In carrying out the process with molybdenite and iron pyrites, about 100 pounds of 80% molybdenite concentrates (containing no'iron) is mixed with about 50 pounds of iron pyrites (containing about 82.56% FeS and the mixture roasted at about 5-600 C. for about one hour, thereafter gradually increasing the temperature and nishing at about 1000 minutes.

In carrying out the process with molybdenite and an oxide ore of iron, about 100 pounds of 80% molybdenite (containing no iron) is mixed with about 30 pounds of iron ore containing 82.27% FeO, and the mixture roasted at about 5600 C. for about one hour, thereafter gradually increasing the temperature and finishing at about 1000C.

for fifteen minutes.

These figures, it should be understood, are merely illustrative and not restrictive of the invention. j a

In a copending case filed by the same applicant on September 19, 1922, Serial No. 589,240, is disclosed a process for making calcium molybdate by subjecting molybdenum and calcium containing materials to an oxidizing roast, the preferred calcium containing material being calcium carbonate.

While this process is particularly applicable to producing iron molybdate, it is intended to cover the chemical equivalents of iron in the reactions noted above.

I claim as my invention 1. The process of producing. molybdates, comprising subjecting a mixture containing molybdenum and iron to an oxidizing roast.

2. The process of producing iron molybdate, comprising subjecting a mixture of an ore of molybdenum and an ore of iron to an oxidizing roast.

O. for fifteen 3, The process of producing iron molybdate, comprising subjecting a molybdenum .containing material toan oxidizing roast in date, comprising subjecting a mixture of molybdenum sulfide and iron sulfide to an oxidizing roast.

7. The process of, producing iron molybdate, comprising sub ecting an ore already containing molybdenum and iron to an oxidizing roast.

8. The process of producing iron molybdate, comprising subjecting an ore containing about 80% of molybdenite. to an oxidizing roast in the presence of an iron supply ing material.

9. The process of producing ironmolybdate, comprising concentrating an ore already containing compounds of molybdenum and iron, adding more iron supplying material if necessary, and subjecting the mixture to an oxidizing roast.

10. The process of producing ferric molybdate, comprising subjecting a molybdenum containing material to an oxidizing roast in the presence of an iron supplying material.

11. The process of producing ferric molybdate, comprising subjecting a mixture of a molybdenum containing material and ferrous iron to an oxidizing roast.

In testimony whereof, Ihave signed myname to this specification.

ALAN xissoox. 

